To set up IMAP an your iPhone or iPod touch:
http://www.google.com/support/a/bin/static.py?page=guide.cs&guide=22229&topic=22246#148972

Gmail for mobile on your iPhone:
http://www.google.com/mobile/products/mail.html#p=apple

Google Sync for your iPhone:
Synchronize the built-in Mail, Calendar and Contacts apps on your iPhone with your Google account.
http://www.google.com/mobile/products/sync.html#p=apple

Last update: 03:45 PM Wednesday, December 9, 2009

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